Which sentence BEST explains a central idea of the text? Birds that work together accomplish more than one bird alone.
What a blue jay thinks is a hole for storing acorns turns out to be a house instead.
A blue jay hopes to store enough acorns to feed his family,
People can learn a lot from the behavior of the animals around them.

Either the very first sentence or the very last sentence.

Explanation:

The first sentence because it is mainly talking about birds, trying to prove the point. The second sentence because it could have just been talking about the birds for an example on how people could learn a lot from animals..

c. a group of tribes that formed a confederacy